Starting from a top student and marching towards the sea of ​​stars

Chapter 101 Teacher Xu, I found a new problem

A few minutes later, Lin You joined Ning Chen and Song Xiyun.

Ning Chen saw that Lin You's complexion was not bad, it seemed that there was really nothing serious about his body.

Ning Chen thought about where they were going to stay together for a while. After all, they had visited Yanda campus yesterday, and it was very cold outside at night, so they couldn't stay outside all the time.

"How about we go to my place to play cards for a while?" Ning Chen suggested.

Song Xiyun and Lin You glanced at each other, and both felt that this proposal was good.

"Yes, I'm good at poker. Every year during Chinese New Year, I can win a lot of money when I play poker with my family." Lin You said with a smile.

"What a coincidence, so is my sister."

"Then let's go, my place is quite spacious."

Ning Chen bought a pair of playing cards at a nearby supermarket, brought Lin You and Song Xiyun to the hotel.

Opening the door, both Lin You and Song Xiyun were amazed by the environment inside.

"Ning Chen, you are treated well, living alone in such a luxurious room."

"Yes, in fact, it is enough to open a standard room. It is a waste for me to live in such a big room."

After taking off his coat, the three of them sat around the coffee table. Ning Chen took out the playing cards and shuffled them.

"The three of us just happen to be able to fight landlords, and the two of you are sure to be able to play too?"

"Of course."

"Well, I can play."

"Then let's unify the rules first."

Because the gameplay is somewhat different in different places, in order to prevent disputes in the subsequent game process, the three discussed the rules of the game with each other.

"We won't play for money, and put stickers on our faces when we lose." Song Xiyun suggested.

"Okay, let's get started."

The three of them are full of confidence in their poker skills. They are all the best students in the mathematics department in the country. They can master all kinds of skills such as card memorization and card type reasoning.

Sure enough, when the game started, all three of them played their cards very beautifully, as if they were professional players competing.

After a few rounds, Ning Chen confirmed that Lin You and Song Xiyun's card skills were obviously higher than Liao Jun and Tong Yicheng's.

This feeling of fighting wits and courage is somewhat similar to the pleasure of doing math problems.

However, playing cards is not a completely fair game after all. Sometimes one party's cards are particularly good, and no matter how the others calculate, they will be powerless.

Before they knew it, the faces of the three of them were all covered with notes.

At this time, Ning Chen glanced at the time and found that it was already ten o'clock in the evening.

"It's ten o'clock so soon? What time do your dormitories close?"

"Normally it's eleven o'clock, but it doesn't matter if it's later, I can ask my roommate to open the door for me."

"The aunt in our dormitory is very nice, and she will open the door when I go back late."

Both Song Xiyun and Lin You expressed that they were not in a hurry to go back. After all, Ning Chen finally came to Yanjing once, and the three of them were having a good time.

"Well, let's play for another half hour and don't go back too late."

"Alright, then let's play for another half an hour."

Half an hour passed quickly, and the three of them felt a little unfinished, but when the time came, it was time to go back.

After seeing off Song Xiyun and Lin You, Ning Chen felt a little empty in her heart. Ning Chen felt that this should be the feeling of emptiness after the happy ending.

……

After staying in Yanjing for another two days, Ning Chen packed up his things and prepared to return to Shengzhou.

In the past two days, Ning Chen and Qiu Chengtong met twice again and talked about continuing to solve Qiu Chengtong's conjecture, which gave Ning Chen a lot of new gains.

The day before leaving, Ning Chen went to Yanda to see Song Xiyun and Lin You, and welcomed them to come to Shengzhou to play if they had time, so that he could show his friendship as a landlord.

After completing the check-out procedures, Feng Lan has already prepared a car to take Ning Chen to the airport.

After nearly two hours of flying, Ning Chen finally set foot on the familiar land of Shengzhou.

"Although Yanjing is good, Shengzhou is more friendly." Whether in Shuimu University or Yanjing University, Ning Chen didn't have that sense of belonging. Even though he stayed in the training camp of Shuimu University for three months, Ning Chen Ye still felt that it was just a place to study temporarily.

But after returning to Shengzhou University, Ning Chen felt as if she had returned to her own home.

Not caring about rest, Ning Chen came to Xuzhou's laboratory to learn about the latest progress of the experiment.

Seeing Ning Chen coming over, Xu Zhou seemed in a good mood.

"Ning Chen, you're back, how is the open class going?"

"It's good. It's really an indescribable feeling to teach so many teachers and students of Shuimu University..."

Listening to Ning Chen's description, Xu Zhou couldn't help being a little envious, thinking that he would experience this feeling one day.

"Teacher Xu, how is the progress of the experiment these days?"

"In the past few days when you were away, the progress of the experiment has indeed made some breakthroughs. Well, you can see for yourself."

Ning Chen looked at the experimental data in Xu Zhou's computer, and his eyes widened.

"Mr. Xu, using this new type of porous silicon-copper composite material as the negative electrode of lithium batteries, can it still have such a high reversible capacity after 50 cycles?"

Seeing Ning Chen's surprised look, Xu Zhou also felt a sense of accomplishment in his heart.

"Yes, even after 50 charge-discharge cycles, its reversible capacity still reaches about 900mAh/g. Compared with the previous pure porous silicon lithium battery negative electrode, this data is much improved."

After redesigning the silicon-based anode material, although the first reversible capacity of the lithium battery dropped a little, the reversible capacity after multiple cycles increased a lot.

Compared with the original silicon-based negative lithium battery, this result is undoubtedly more exciting.

"Mr. Xu, do you think this kind of lithium battery that uses a new type of porous silicon-copper composite material as the negative electrode has the ability to enter the application stage?"

"From the current data, the direct application is definitely worse, but this has proved that the direction we imagined before is completely feasible. We can continue to modify the material composition ratio of this material, or replace it with other materials. Metallic substances, more detailed experiments are carried out."

Obviously, the success of the experiment at this stage has greatly improved Xu Zhou's confidence, which also made Ning Chen more affirmed Xu Zhou's professional ability.

"Mr. Xu, can you give me a copy of the experimental data?"

"Of course, you can copy it. You just came back from Yanjing today, so you should have a good rest today and don't use it for experiments."

"Well, then Teacher Xu, I'll come back tomorrow."

Ning Chen didn't want to drag his tired body to do the experiment. In addition, Ning Chen also wanted to go back and analyze the experimental data carefully to see if he could draw some valuable conclusions.

Back at the house in Xiangdu Garden, Ning Chen took a hot bath first, and while relieving himself from fatigue, he also cleared up his brain.

Back in the study, Ning Chen turned on the computer and looked at Xuzhou's experimental data these days.

Combined with some of the research data on silicon-based negative electrode materials for lithium batteries obtained through the system, Ning Chen can be sure that they are on the right path.

"Ms. Xu is indeed the top young expert in materials science, and he immediately thought of the right direction to solve this problem."

With the help of these experimental data, Ning Chen completed some missing parts of the system data.

But at this time, Ning Chen discovered a new problem.

Only the silicon-based and metal-combined negative electrode materials will experience a sharp drop in reversible capacity when the number of charge-discharge cycles is sufficient.

"No... Adding metal substances to porous silicon, although it is a correct direction, cannot solve all problems."

Although the number of cycles of 50 times is relatively large in the experiment, in real applications, the number of cycles of lithium batteries needs to reach hundreds or even thousands of times.

Only through more cycles in the experiment can more problems be exposed.

As for the specific reasons for these problems and the corresponding solutions, Ning Chen is still unable to analyze them through the incomplete data.

Ning Chen decided to explain his thoughts to Xu Zhou when he went to the laboratory tomorrow.

The next day, Ning Chen came to the laboratory early, but found that Xu Zhou had already arrived and started his own experiment.

"Yo, Ning Chen, you're here so early."

"Mr. Xu, you came earlier than me."

Xu Zhou attaches great importance to this experiment. On the one hand, this is the first ten-million-level horizontal project that Xu Zhou has taken on. On the other hand, Xu Zhou also wants to prove that his scientific research ability is strong enough through this research. .

"How about it, Ning Chen, looked at the experimental data last night, did you find any problems?"

"Mr. Xu, there is nothing wrong with the experiment itself, but I do have some ideas that I would like to discuss with you."

(End of this chapter)